Die for making folding paper boxes.



R. J. G RUENBERG. DIE FUR MAKING VFOLDING PAPER BOXES.

.APPLIUATIN FILED AUG. 21, 1912.

` Patented Dec. 9, 1913.

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RAOUL J. GRUENBERG, or sniarnnivclsco, CALIFORNIA.

DIE FOR MAKING FOLDING PAPER BOXES.v

Specification of. Letters Patent.

Patented Dec. 9. 1913.

Application filed August 21', 1912. Serial No. 716,191.

' San Francisco, in the county of San Francisco and State of California, have invented a new'and useful Die for Making Folding Paper Boxes, of which the following is a. specification in such full and clear terms as will enable those skilled in the art to construct and use the same.

This invention relates to a die for creasing paper box stock, the object being to provide means whereby the paper stock .may be.

drawn inwardly a suticient amount to permit the proper creasing thereof and to make a good fold at the corners of the box.

Another objectof the invention is to provide means whereby the rule used for creasing the therein, thus making the ytotal bend along one of said creases lessithan would be the 'total bend where but a single crease is lused `to shape the paper stock.

Another object ofthe invention is to produce at one time the entire series of creases necessary and in the same operation to effect the cutting of the paper stock without straining the stock along the creases formed, thus accomplishing a result heretofore possible with heavy paperonly when the creasing and cutting are .carried out by separate operations.

A further object of the invention is to produce a crease in the paper stock which will be of such a nature as to allow the paper stock to bend easier than where the ordinary crease is used in one operation, and as easy aswhere the cutting and creasing are done in separate operations.

An object of this invention is to produce a creasing and cutting die which may. be used in any platen or cylinder press.

In the drawings in which the same numeral of reference is applied to the same portion throughout the several view s, Figure 1 is a plan view of a die showing the knives and creasing rules carried thereby, Fig. 2 is a sectional view showing the knife and one of the creasing rules as thej.T are about to impinge upon the paper to be cut, Fig. 3 is a sectional view showing the creasing rule pressing the paper into the female die and indicating the knife )ust in contact. therewith, Fig. l shows the final position with the creasing rules seated against the paper solidly and the knife seated against paper stock will form two creases the steel plate upon which .the cutting is accomplished, Fig. 5 shows the effect of a' bend of 180 with the rule used in'this die, and Fig. 6 shows the effect of a 1800 bend in the paper stock when the ordinary creasing rule is used.

The numeral 1 indicates a suitably heavy Iframe within which the die parts are secured, suitable blocking 2,' 3, 4, 5, G, etc., being used to hold the knives 7 and creasing rules 8 in their proper places. Thecrcasing rule is indicated in section in Fig. 2 at 8, 9 indicating the steel plate upon which the cutting is accomplished.

10 indicates the knife, and the relative position of the knife and v'creasing rule is shown with. the creasing pale about to engage the sheet of paper stock 1l.. Secured upon the 'plate Sis a sheet of hard paper stock 12 in which .slots 13 have been eut for the crease forming rules to project the paper stock into. .Y

The ycrease forming riile 8 is provided with a depending ridge or l"bar 14, the width of which is greater than the thickness of the stock to be creased and at each side of the depending portion ofthe rule there is a shouldered portion 15,7' each of said shouldered portions being greater in width. than the thickness of the stock to be creased in order that they may rest tightly -upon the paper stock at the edges of the slots in the female die, thus forming ltwo sharp creases.

The two shoulder portions l5 of the rules 8 are each narrower than the ridge 14 .to

more deeply crease the paper under said shoulders. s

The vspacing of the knife edges out of the plane of the edges of the creasing rules and the shape of vthe die block to gather the stock, as well as the necessity therefor, is indicated in Figs. 2, 3 andl. lt will be seen in Fig. 3 that the rule has depressed the paper as indicated at 16 and has to form said crease drawn the paper in the direction of the arrow such an amount as is necessary to produce the depression therein. 1n the same figure it will be observed that the knife is just barely in contact with the paper so that this lateral movement thereof (indicated by the arrow) has taken.

place before the cutting can occur, therefore, the material may be readilydepressed into the female die and when so depressed is cut, thus leaving the cut blank in the propershape for making a perfect boX.

It -will, of course, be clear to those sllled the art that the knives and rules may be inserted .in the die form in a great number gf positions to make any" desired Form of ox.

The nature of the fold made by the ordinary creasing rule and the creasing rule disclosed herein is exhibited in Figs. 5 and 6, in which the two portions of the paper stock Aas indicated at 19 and 20 are bent back substantially 180, the joining portion 21 having two bends' of'vabout 90 each. rThe behavior of the same piece of paperv stock when crea-sed with theordinary narrow rule is indicated at 22, where it will be seen that .the paper. has cracked andthere is but a single bend of aboutl80".

Having thus described my invention what I claim as new and desire to secure by4 Letters Patent of the United States, is as follows:

1. -A die and cutting block for producing complete box blanks 'in a single operation comprising a cutting block higher under the rules than under the knives, a series of knives an'd creasing rules for each edge of the paper stock, said rules being so positioned with respect .to the edges of thie knives as to gather the stock before the knives cut and hold it, substantially as described.

2. A die and cutting block for producing complete box blanks in a single operation comprising a cutting block higher under the rules than under the knives, a series of creasing rules for-each edge of the paper stock, and a series of knives surrounding the creasing rules, said rules being so positioned with respect to the knives and block` as to gather the stock. for the creases before the knives cut and hold it, substantially described.

hold it, substantially as described'.

4. VA die and cutting block for producing box blanks in a single operation comprising a fiat cutting block having a central portion raised the thicknessof the paper stock to be cut and in which raised v portionA grooves are formed, a creasing rule carried by thev die over each of said grooves, and a series lof knives entirely surrounding the creasing rules. A p

' 5. A d-ie and cutting block for producing box blanks in a single operation comprising a fiat cutting block having a central portion raised the thickness of the paper stock to be 'cut and in which raised portion'v a series of grooves are formed, a creasing'rulefcarlzied by the die over each groove, each creasing rule having a ridge adapted to force the paper to be cut into said grooves and having narrower shoulders at each sid'e'of the ridge to press the paper lto be cut against'the. cutting block, and a series of knives `en- L tirely surrounding the creasing rules.

' In testimony whereof I have hereunto set my hand this 15 day of August A. D.

l1912, in the presence' of the two subscribed .witnesses RAOUL J. GRUENBERG.

Witnesses:

C. P. GRIFFIN, L. H. ANDERSON. 

